:root{--bg:#fff;--surface:#fff;--surface-subtle:#f7f8fa;--text:#1f2937;--muted:#6b7280;--border:#e5e7eb;--accent:#2563eb;--accent-text:#fff;--warn-bg:#fff7ed;--warn-text:#9a3412;--preview-bg:#f7f8fa;--radius:14px;--lightningcss-light:initial;--lightningcss-dark: ;color-scheme:light}*{box-sizing:border-box}[hidden]{display:none!important}.visually-hidden{clip:rect(0, 0, 0, 0);white-space:nowrap;border:0;width:1px;height:1px;margin:-1px;padding:0;position:absolute;overflow:hidden}body{background:var(--bg);color:var(--text);-webkit-text-size-adjust:100%;margin:0;font-family:Hiragino Sans,Noto Sans JP,Yu Gothic UI,Meiryo,system-ui,sans-serif;line-height:1.6}.site-header{text-align:center;padding:28px 16px 8px}.site-header h1{margin:0;font-size:1.6rem}.tagline{color:var(--muted);margin:4px 0 0;font-size:.9rem}.layout{grid-template-columns:minmax(0,1fr);grid-template-areas:"input""preview""options""about""support""ad";gap:14px;max-width:1040px;margin:0 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